Processes for making catalyst compositions having improved flow
US-2015353651-A1 · Dec 10, 2015 · US
Production of superabsorbent polymers
US9505853B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9505853-B2 |
| Application number | US-52194508-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 14, 2008 |
| Priority date | Jan 16, 2007 |
| Publication date | Nov 29, 2016 |
| Grant date | Nov 29, 2016 |
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- Title
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Abstract
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The invention relates to the production of superabsorbent polymers comprising conveying a polymer gel having acid groups on an oscillating conveyor belt to a continuous through-circulation belt dryer, wherein the belt speed of the conveyor belt is at least 0.4 m/s.
First claim
Opening claim text (preview).
We claim: 1. A process for production of superabsorbent polymers comprising i) polymerizing a monomer solution in a polymerization reactor to form a polymer gel, the monomer solution comprising at least one ethylenically unsaturated acid-functional monomer, ii) conveying the formed polymer gel on an oscillating conveyor belt having a belt speed of at least 0.8 m/s and transferring the formed polymer to a continuous through-circulation belt dryer, and iii) drying the polymer gel on the continuous through-circulation belt dryer wherein a water content of the polymer gel before drying is at least 30 wt. %. 2. The process according to claim 1 wherein 60 mol-% or less of the acid groups of the at least one ethylenically unsaturated acid-functional monomer are neutralized. 3. The process according to claim 1 wherein 40 mol-% or less of the acid groups of the at least one ethylenically unsaturated acid-functional monomer are neutralized and the degree of neutralization of the formed polymer gel is raised to at least 50 mol-%. 4. The process according to claim 1 wherein the polymerization reactor is a continuous belt reactor. 5. The process according to claim 1 wherein the polymerization reactor is a continuous kneader. 6. The process according to claim 1 wherein a width of the continuous through-circulation belt dryer is at least 2 m. 7. The process according to claim 1 wherein the monomer is at least 50 wt. % acrylic acid. 8. The process according to claim 1 further comprising classifying of the dried polymer gel. 9. The process according to claim 8 further comprising surface crosslinking of the classified polymer gel. 10. The process according to claim 1 wherein the belt speed of the oscillating conveyor belt is at least 1.2 m/s. 11. The process according to claim 1 wherein the belt speed of the oscillating conveyor belt is at least 1.6 m/s.
Assignees
Inventors
Classifications
- C08F2/00Primary
Processes of polymerisation · CPC title
Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title
the belts being all horizontal or slightly inclined (F26B17/08 takes precedence) · CPC title
Treatment of solid polymer wetted by water or organic solvents, e.g. coagulum, filter cakes · CPC title
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- What does patent US9505853B2 cover?
- The invention relates to the production of superabsorbent polymers comprising conveying a polymer gel having acid groups on an oscillating conveyor belt to a continuous through-circulation belt dryer, wherein the belt speed of the conveyor belt is at least 0.4 m/s.
- Who is the assignee on this patent?
- Weismantel Matthias, Funk Rüdiger, Blair Leigh R, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification C08F2/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 29 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).